Oldsmobile Olds 350 Rocket Camshaft Installation timing marks alignment.
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- เผยแพร่เมื่อ 17 ก.ย. 2024
- In this video I talk about hot to install a new camshaft and align the timing gears with the crankshaft for proper setup and timing. I also talk a little about comp cams valve train packages.
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The reason you align the crank gear at 12:00 and the cam gear at 6:00 is because it is easier to align the marks. If you turn the crank 1 rotation your marks will be 12:00 and 12:00.
David Collis yes and then you will be at TDC for cylinder #6 and your timing will be 180 degrees off. That's why you line it up at 12 and 12 TDC #1
@@PrecisionComputing It depends on whether you left your dist in or it has been removed. If you line the marks up facing each other and your dist is still installed you will see that it is on #6 cyl which is correct. If the marks are facing each other and you put your dist in and line it up on number #1 it will be 180 degrees out.
David Collis I don't know a single engine builder that installs a camshaft with the distributor still in the block, as the camshaft cannot be installed because the teeth won't line up. So then once you try to line the teeth up, who knows where you're marks will be.
@@PrecisionComputing I never said anything about installing a camshaft with the dist installed. We are talking about timing chain and gears with the camshaft in place.
David Collis this video is about installing the camshaft.
Thank u soooooooo much bro
No problem!
I could be wrong but I don't think it matters if you install them at 12-12 or 6-12. Say I do it the way you did, if I spin the crank one full turn, the dots will now be facing 6-12 and I will still be at top dead center. I think the reason the book says to do 6-12 is it makes it easier to see that the timing is "true" I installed mine on my 70 olds at 6-12 and I never had a problem. How does the engine run so far with that cam and lower compression pistons? Cool build btw. Wish you had more videos on it.
Useful Entertainment it has to be 12/12 at TDC Compression stroke, otherwise it won't start. If you put it in at 6/12 TDC would be on intake stroke. I haven't fired her up yet, dropping it all in this week actually. Will have many more videos, make sure to subscribe.
Useful Entertainment Also, the 1971 Olds motor even with the dish Pistons is 9.3:1 compression. With the head work I've done, and everything matched she should be a beast.
Precision Computing by Marc Molella I get where your going. What I was getting at is if you instal them at 12 and 6 like I did, just make sure you spin the crank one full revolution and the dots will then be at 12 and 12 and #1 will now be on the compression stroke. I subbed btw.
Useful Entertainment if you do that, you have to make sure the distributor is pointing to the correct cylinder, otherwise it will be 180 degrees off. I would recommend installing at 12/12 TDC compression stroke and installing the distributor facing the #1 point and you won't have to guess.
Useful Entertainment thanks for the sub!
Noticed you had dished pistons on this engine would this be a post 70s engine? Is that how Oldsmobile lowered the compression on the 350s?
2bbl cars in 1970 had dished pistons of this type. That is why 4bbl option cars had higher compression stats, flat pistons. Later compression drop was due to change in head dimensions.
My 69 350 had the same pistons a little shallower tho
Hey, so I just installed a new cam. Haven’t put it all back together yet. I just slid the cam in. I have the timing aligned at cam 6:00 and crank at 12:00. So, need to turn the motor until they’re both at 12 and 12 and I’ll be good?
If you watch the video I explain it exactly. Cam at 12, crank at 12, #1 piston at TDC on the compression stroke, and yea you will be all good.
If you installed at 6 and 12 and spin the engine one rotation you will not be on compression stroke on #1 cylinder.
So you wouldn't mind explaining why every Olds factory service manual I own from 1968-1988 shows the timing marks align at 6 and 12? You would think 20 years of technical data would have gotten a revision along the way, no? (ref 1970 manual, pg 6B-30, fig 6B-168). Throw that Chilton book in the trash and buy a factory manual. ;)
John Herald you might wanna throw your factory manual in the trash if it says to align at 6 & 12 like my Chilton's. Nope can't explain it, but go ahead and put your camshaft in at 6, align your distributor rotor with TDC #1 cylinder (as I'm sure your factory manual tells you to) and let's see what happens. Meanwhile I'll be over here aligning the cam at 12 and having my motor fire and run as it should.
Do you have an email I can email you at? I have this same engine and I’ve no experience with Olds and have timing questions I wanted to see if you could assist me with or guide me. Thank you.
Go ahead and shoot your questions here, I will do my best to help.
They always had more torque than hp there are things you can do to help the oil return Better to the pan that has always been an achiles heel with them I remember back in the day an olds would come in smoking like a train and the valve covers leaking like a siv take them off and run a coat hanger down the returns and she's back to normal it wasn't uncommon for people to not change the oil as they should have back then seen them so sludged up it was horrendous and it still ran like a champ never saw a two barrel motor have anywhere near the ass a rocket motor with a q jet had and that's really what should be on that old girl for better milage and more kick in the ass when the secondaries open and the moan there's no sound like it lol
What color is the engine painted?
VHT ESP451007 Anodized Blue
@@PrecisionComputing thx a lot, engine looks great!
@@johnyz3415 no problem, thanks! Just make sure to coat with a flat engine paint first for best adhesion is what I found.
@@PrecisionComputing yea I planned on using ppg 385 epoxy primer and then putting that over it 👍
@@johnyz3415 should look great!
What kind of exhaust?
Drew Jones I have headers into 3" exhaust and flowmaster 40 series mufflers.
Love the video but that Olds block painted blue...oval blue just made me puke A ROCKET GETS PAINTED GOLD end of story. Other than that good info
It’s not oval blue, wouldn’t do that, olds engines I believe 74 and later were painted blue, being that it’s going in my 80 Cutlass, and cause I love blue I went blue, but it’s VHT anodized blue.
Hey nice setup,can u tell me if you broke in the cam with the dual springs
Darnell Grays yes, I broke in the cam normally.
They say u can't break in a new cam with dual springs
Darnell Grays I didn't have any issues. Everything is set fine, valve lift as it should be.
The cam supplier will tell you if you need to delete one spring for break in just because it's dual spring does not mean it's got so much force it's gonna take out lobes on break in now I've seen cams that that's exactly what they said to do break it in with just the outer spring then after break in and don't whatever you do wind it up with the single spring it will float and swallow a valve hit pistons and bad things happen. Fast after break in stack the springs and I've never seen an olds take out cam lobes Chevy's yes twice but an olds or Pontiac no but I've done a lot more Chevy's too so with iron heads on anything just under 500 lift is all your gonna need for lift why push it and have problems then you end up with issues 512 is good but see you gotta cut the guides down and the spring seats or no knurl the guides ?
What about 75 Pontiac 400ci 12-12 or 6-12
ENLIGHTENED CHILD OF GOD THE OFFSET I honestly can't say off the top of my head, but normally #1 cylinder needs to be at top dead center on the compression stroke, if you have that correct you should be OK.
Precision Computing by Marc Molella Buick Olds and Pontiac should be the same according to my Chilton manual.
ENLIGHTENED CHILD OF GOD THE OFFSET if they should be the same then 12 and 12 as I state in the video. Just be aware that my chilton manual was wrong.
So the moral of the story is the book is wrong. Both should be at 12 and 12.
J-Styga long story short yes. Lol
Correct .. just did one ..disassemble with mark on balance on 0 .. top dead..distibution on #1 ... took the cover off and lord and behold ..12/12 on the marks...
It doesn't matter if marks are a 6&6 or 12&12 cam timing will be correct since it is a 180 degree motor.
Now if your speaking of ignition timing that's another story